--- /dev/null
+/*
+ * Copyright (C) 2007-2012 Argeo GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.argeo.slc.jsch;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.argeo.slc.SlcException;
+
+import com.jcraft.jsch.JSch;
+import com.jcraft.jsch.JSchException;
+import com.jcraft.jsch.Session;
+
+public abstract class AbstractJschTask implements Runnable {
+ private final Log log = LogFactory.getLog(getClass());
+
+ private SshTarget sshTarget;
+
+ protected Session openSession() {
+ if (sshTarget.getSession() != null) {
+ Session session = sshTarget.getSession();
+ if (session.isConnected()) {
+ if (log.isTraceEnabled())
+ log.debug("Using cached session to " + getSshTarget()
+ + " via SSH");
+ return session;
+ }
+ }
+
+ try {
+ JSch jsch = new JSch();
+ if (sshTarget.getUsePrivateKey()
+ && sshTarget.getLocalPrivateKey().exists())
+ jsch.addIdentity(sshTarget.getLocalPrivateKey()
+ .getAbsolutePath());
+ Session session = jsch.getSession(getSshTarget().getUser(),
+ getSshTarget().getHost(), getSshTarget().getPort());
+
+ session.setUserInfo(getSshTarget().getUserInfo());
+ session.setServerAliveInterval(1000);
+ session.connect();
+ if (log.isTraceEnabled())
+ log.trace("Connected to " + getSshTarget() + " via SSH");
+ if (sshTarget.getSession() != null) {
+ if (log.isTraceEnabled())
+ log.trace("The cached session to " + getSshTarget()
+ + " was disconnected and was reset.");
+ sshTarget.setSession(session);
+ }
+ return session;
+ } catch (JSchException e) {
+ if (sshTarget.getUserInfo() instanceof SimpleUserInfo)
+ ((SimpleUserInfo) sshTarget.getUserInfo()).reset();
+ throw new SlcException("Could not open session to "
+ + getSshTarget(), e);
+ }
+ }
+
+ public void run() {
+ Session session = openSession();
+ try {
+ run(session);
+ } finally {
+ if (sshTarget != null && sshTarget.getSession() == null) {
+ session.disconnect();
+ if (log.isTraceEnabled())
+ log.trace("Disconnected from " + getSshTarget()
+ + " via SSH");
+ }
+ }
+ }
+
+ abstract void run(Session session);
+
+ protected int checkAck(InputStream in) throws IOException {
+ int b = in.read();
+ // b may be 0 for success,
+ // 1 for error,
+ // 2 for fatal error,
+ // -1
+ if (b == 0)
+ return b;
+ else if (b == -1)
+ return b;// throw new SlcException("SSH ack returned -1");
+ else if (b == 1 || b == 2) {
+ StringBuffer sb = new StringBuffer();
+ int c;
+ do {
+ c = in.read();
+ sb.append((char) c);
+ } while (c != '\n');
+ if (b == 1) { // error
+ throw new SlcException("SSH ack error: " + sb.toString());
+ }
+ if (b == 2) { // fatal error
+ throw new SlcException("SSH fatal error: " + sb.toString());
+ }
+ }
+ return b;
+ }
+
+ public SshTarget getSshTarget() {
+ if (sshTarget == null)
+ throw new SlcException("No SSH target defined.");
+ return sshTarget;
+ }
+
+ public void setSshTarget(SshTarget sshTarget) {
+ this.sshTarget = sshTarget;
+ }
+
+}